<?php
defined('BASEPATH') OR exit('No direct script access allowed');
	class Util extends CI_Controller {
	    public function upload(){
			$config['upload_path'] = './public/uploads/';
	        $config['allowed_types'] = 'gif|jpg|png';
	        $config['max_size'] = 0;
	        $config['max_width'] = 1024;
	        $config['max_height'] = 768;
	        $this->load->library('upload', $config);
	        if ( ! $this->upload->do_upload('file')){    //这里的名字file与form的js中的fileName的名字一样
	            $error = array('error' => $this->upload->display_errors());
	            echo $this->upload->display_errors();
	        }else{
	            $data=$this->upload->data('file_name');
	            echo 'uploads/'.$data;
	        }
	    }
	}
